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OK, I can't sleep at night cause I'm thinking about this fuel injection line stuff. To recap, 2002 4.6 in a 61 Galaxie. Donor is a Crown Vic, police interceptor. I went to the salvage today and did some investigation on a 2000 cop car. What I discovered is fuel supply and return lines are 1/4" lines with one exception...the supply line off of the fuel tank is 3/8" stainless braided for about 16" then converts to 1/4". Why? ( My guess is the supply line has larger quick connect ends at the tank and the fuel rail only for identification on the assembly line so the lines don't get crossed) NOW FOR THE MILLION DOLLAR QUESTION: Will I be okay using 1/4" high pressure rubber line and stretching it over the 3/8" supply fitting at the tank or is it necessary to use 3/8" and drop down to a 1/4" like factory?
Picture of supply and return lines from tank. Larger 3/8" is the supply(bottom one)
Supply(stainless braided with blue loom covering is supply), converts down to 1/4" after the stainless braided part, then goes all the way to the fuel rail. 
Quick connects at fuel rail. Notice the larger one(the one to the right), that is the supply line, however, the inside diameter is 1/4", same as the return.
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I know we weren't much help, did you get it sorted out so you can sleep at night 
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Still suffering from insomnia! Lol. I went with 1/4" I.D. Rubber barrier protected fuel injection line front to back both lines. Will see what happens. Pretty sure I will be fine. Like I said with the exception of about the first 14" of supply on OEM being 3/8", it's all 1/4" on a Crown Vic. If I was running high horsepower and needed more volume of fuel then larger diameter hose is the way to do it.
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Ok...sleeping much better at night!
To put this issue to rest...the 1/4 inch fuel lines seem to be supplying the engine with the amount of fuel it needs. I have tried accelerating at WOT and engine ran fine.
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The reason ford makes the one fitting bigger on the tank
Yet the inner diameter is the same , is to keep the assembly line workers from hooking up the lines the wrong way..
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glad you got it working. When you were first pondering this there was one variable we didn't consider and thats pressure. Because EFI requires high pressure fuel lines diameter is less of an issue.
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